Sorcha, we had neighbors like that once. parties four times a week into the early hours of the morning. When they weren't partying next door they left their kids alone and they screamed the whole time. No amount of polite requests helped. One night we had had enough. We waited 'till they got home around 4 AM. Kept quiet for about twenty minutes 'till they were fast asleep. Then we put the speakers against the joining wall and cranked it up full for the rest of the night.